RibbedHero
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http://uk.ign.com/articles/2015/06/05/why-xcom-2-had-to-be-pc-exclusive
More at the link.
When we looked at what we wanted to do with the sequel, we had all these very, very ambitious goals,” said Solomon. On his must-have list were high-fidelity characters and environments, better-looking destruction, physically based rendering, and the crown jewel he’d wanted to get into Enemy Unknown but couldn’t: procedurally generated maps. “To do that, we had to use all of our studio expertise … and our expertise here is PC. That's our home, and that's where we're really comfortable.”
Focusing all of Firaxis’ efforts on the PC made logistical sense to DeAngelis, too. “Internally, with a relatively small team for the size of the game that we are, to be able to say we can focus on our platform that the studio has a pedigree for, and that X-COM: UFO Defense has a pedigree for, as PC-only... it just made a lot of sense, and that's how we wanted to dedicate our time.” XCOM 2 runs on a heavily modified version of Unreal Engine 3.5 (Firaxis’ customizations are too extensive to easily move to Unreal 4), which in some ways has been rewritten to the point of being “unrecognizable,” and it’s much simpler to make that work on one platform than three or more at once.
he most obvious change resulting from those conversations is how the team is optimizing the interface to be mouse-and-keyboard friendly,
And though Firaxis plans to add it in the future, the current plan is to launch without gamepad support.
More at the link.